WorksheetsChapter 4 Chemistry Form 5
Total questions: 17
Worksheet time: 12mins
Which of these is an example of synthetic polymer?
cotton fibers
rubber
wool
polyvinyl chloride (PVC)
What is the name of the reaction used to make polymers?
polymerization
cracking
polygonization
precipitation
Which polymers occur naturally?
Starch and Nylon
Starch and Cellulose
Proteins and Nylon
Proteins and PVC
Which of the following reaction is NOT accompanied by elimination of a byproduct molecule?
addition polymerization
condensation polymerization
both of the mentioned
none of the mentioned
Define polymer
circular molecule made with many repeating units
short molecule made of a few repeating units
long, chain-like molecule made of repeating units
chain-like molecule that contains hydrogen and oxygen
The IUPAC name of natural rubber is
poly(chloroethene)
poly(2-methylbut-1,3-diene)
poly(tetrafluroethene)
polymethyl methacrylate
What should be done to natural rubber to produce tyres that are harder and more heat resistant?
heat with sulphur
add iron wire
add ammonia solution
add ethanoic acid
A rubber tapper finds that latex coagulates after several hours. What substance should be added into the latex to prevent it from coagulating?
Ethanoic acid
Sodium chloride solution
Ammonia solution
Disulphur dichloride
Which of the following is the correct structure of vulcanised natural rubber?
Which of the following is the monomer of natural rubber?
The protein membrane of natural rubber is surrounded by negative charge. What is the name of a process if the natural rubber is added with ethanoic acid?
Vulcanisation
Polymerisation
Coagulation
Hydrogenation
Which of the following is not the property of natural rubber?
Sensitive to heat
Elasticity decreases over time
Easily oxidized by air
Hard and brittle
Fresh latex will coagulate if left overnight because
Latex produce lactic acid
Latex oxidised by oxygen in the air
The bacteria in the air react on the protein membrane to produce lactic acid
The bacteria in the air react on the protein membrane to produce alkaline solution
Natural rubber cannot withstand heat. Which process can make natural rubber harder?
Heat the natural rubber with copper (II) oxide
Heat the natural rubber with methane gas
Dip the natural rubber with ammonia solution
Dip the natural rubber in solution of disulphur dichloride in methyl benzene
Which of the following is true about vulcanized and unvulcanized rubber?
Vulcanized rubber is less elastic than unvulcanized rubber
Vulcanized rubber become soft and sticky easily compared to unvulcanized rubber
Vulcanized rubber is stronger than unvulcanized rubber
Vulcanized rubber is more easily oxidised than unvulcanized rubber
Synthetic rubber is a type of .................. polymer.
elastomer
thermoplastic
thermosetting
